气井涡流排液采气工具有效作用长度

Effective length of vortex tools for liquid discharge in gas wells

 陈德春¹ 姚亚¹ 韩昊¹ 付刚¹ 宋天骄¹ 谢双喜²

中国石油大学（华东）石油工程学院，山东 青岛 266580 中海油能源发展股份有限公司工程技术分公司，天津 300456）

College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China Engineering Technology Company, Energy Resources Development Co. Ltd., CNOOC Ltd., Tianjin 300456, China)

 针对目前对涡流工具适用条件和工具有效作用长度认识不清，现场应用与分析主要依据经验，进而影响使用效果等问题，运用AutoCAD和Fluent流体模拟软件，建立涡流工具气液两相流场模型，研究流体旋转强度的衰减规律，预测涡流工具有效作用长度，并分析井筒气液状况和工具结构参数对有效作用长度的影响。研究结果表明：流体旋转强度的衰减规律符合对数递减，以对数递减公式预测的涡流工具有效作用长度介于10~100 m；流体入口速度和井筒气液比是影响工具有效作用长度的主要因素，入口速度和气液比增大，有效作用长度增大；槽宽为60 mm时，工具有效作用长度较大，排液效果较好；减小槽深和工具与油管之间的间隙，流体速度增大，有效作用长度增大。研究结果可为现场涡流工具结构参数优选和排液效果的提高提供理论依据。

 At present, there is still no clear understanding of applicable conditions and effective length of vortex tools, and field application and analysis are mainly based on experience, which can weaken the application effect of vortex tools. In order to study the attenuation law of fluid swirl intensity, predict effective length of vortex tools, and analyze the influence of structure parameters and gas-liquid condition on effective length, Fluent and AutoCAD software are applied to establish two-phase vortex flow models. The research shows that fluid swirl intensity is conformed to logarithmic decrement and the effective length of vortex tools is in the range of 10￣100 m. Furthermore inlet velocity and gas-liquid ratio are main factors influencing the effective length of vortex tools, and with the increase of inlet velocity and gas-liquid ratio, effective length becomes greater. Longer effective length and better liquid removing efficiency is with 60 mm trough width. With the decreases of trough depth and the space between vortex tools and tube, fluid velocity becomes higher and effective length increases. The results provide theoretical basis for the structure parameter optimization and improvement of drainage efficiency of vortex tools.

10.6056/dkyqt201604028